she's claiming it was self-defense. but today, explosive new tapes reminded the jury that that was not always her story. here's abc's ryan owens. >> if travis were here today, he would tell you that it wasn't me. r >> reporter: her web of lies untangles before our lies. >> i'm all for the ten commandments. thou shalt not kill. >> reporter: every detail shown to riveted jurors, who will decide if jodi arias should die for her crime. >> if i hurt travis, if i killed travis, i would beg for the death penalty. >> reporter: for the last three days, the prosecutor has played interrogation videos of arias from july of 2008. she's just been arrested for the brutal murder of alexander. >> i'm begging you to at least come clean and tell me why. >> i wish that i had answers. i'm sorry. >> reporter: he was found butchered in the somehhower of home. >> if i was trying to kill somebody, i would use gloves. i have plenty of them. >> reporter: the 30-year-old businessman and devout mormon had been stabbed 27 times. his throat slit so d